Sink



FIG. 1 is a front perspective view of a sink showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is a side view of the opposite side of FIG. 4;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The sink is shown with symbolic breaks in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design. 

CLAIM I claim the ornamental design for a sink, as shown and described. 